The /boot partition sometimes needs a bit of attention. If you enable
automatic updates, it will fill up with old kernels that you'll probably
never need. It also will stop you from running aptitude to install or remove
anything. If you find yourself in this situation, you can use
dpkg to get
around it. dpkg is the higher-level package manager in Debian-based
distributions, and it's very useful when aptitude has broken.
To see the status of your partitions, run: df -h: